Box support



FIG. 1 is a side view of a box support;

FIG. 2 is a perspective view of the box support of FIG. 1; and,

FIG. 3 is a reduced size side view of the box support of FIG. 1 in use.

In the drawings, the broken lines depict unclaimed environmental subject matter. 

The ornamental design for a box support, as shown and described. 